The Selenium-Based Hexameric Macrocycle[(Se=)P(mu-NtBu)2P(mu-Se)]6

摘要

Recently,we have developed logical approaches to a family of phosphorus-nitrogen-based macrocycles of the type[{P(mu-NR)}2(mu-Y)]_n.The tetrameric,nitrogen-bridged macrocycle[{P(mu-NtBu)}2(mu-NH)]4(Scheme la)is obtained by the condensation of the dimers[ClP(mu-NtBu)]2 and[(NH2)P-(mu-NtBu)]2 in the presence of Et3N.However,the pentame-ric homologue is produced exclusively if this reaction is undertaken in the presence of I~-ions,resulting in the host-guest complex[{P(mu-NtBu)}2(mu-NH)]5 I~-(Scheme 1b).